METHOD FOR DETECTING LASER WELDING QUALITY IN BATTERY MODULES

Abstract

The invention relates to a method (100) that enables determining the quality of the joining processes carried out with laser sources during the production phase of battery modules by using thermochromic film coating.

Description

1 TARIFF LASER WELDING INSIDE BATTERY MODULES QUALITY DETERMINATION METHOD Technical Area 5 The invention involves using laser welding during the production phase of battery modules. thermochromic film coating improves the quality of the bonding processes performed. It relates to a method that enables identification using this method. Previous Technique Traditional laser welding applications are used for joining battery modules. They are commonly used in these processes. However, these sourcing methods sometimes have specific limitations. This can lead to problems. Battery modules combined with laser sources, 15 The source area may have quality issues or defects. In particular, heat Uncertainties in factors such as distribution, density, and homogeneity of the source This can affect the quality. This situation affects the performance of battery modules and This could negatively affect its credibility. With traditional methods, the distribution and homogeneity of heat in the source area... Sufficient and direct observation on this matter is not possible. Therefore, to determine the quality of laser sources in the production of battery modules and A more effective method is needed to improve it. Previous techniques were generally used to determine the quality of laser welding processes. This includes approaches such as visual or manual examination. However, these methods are not the source. critical factors such as heat distribution, density and homogeneity in the region They may be limited in their ability to determine directly and precisely. 2 Chinese patent CN107234339, which falls under the known state of the art. The document mentions a laser welding system. This refers to a Chinese patent. The invention described in this document specifically concerns the coating paint of sheet metal parts. It relates to laser welding equipment capable of performing this task. For sheet metal parts. Laser welding equipment capable of performing coating paint, welding process 5 low risk, high weld joint tightness and high weld quality and technical effects such as time and labor savings in the sourcing process The aim is to achieve this. Laser welding equipment, supports, first guide. rail, first guide bushing, first screw rod, first pressing block, a support a bar, a mounting plate, a control block, a connecting rod, a support 10 The invention includes components such as a plate and a second guide bushing. low risk of the process, high source quality, and source This process has effects such as saving time and labor. Brief Description of the Invention 15 The aim of this invention is to utilize laser sources during the production phase of battery modules. thermochromic film coating improves the quality of the bonding processes performed. It is about implementing a method that enables identification using this method. Another aim of this invention is to create laser sources using thermochromic film. This allows for real-time and direct monitoring of its quality. Another purpose of this invention is to combine thermochromic film coating with laser welding. 25 by providing information about the heat distribution, density and homogeneity in the source region. The aim is to enable the acquisition of valuable and direct information. 3 Detailed Description of the Invention The purpose of this invention was achieved through "Battery Modules Inside". The "Method for Determining Laser Welding Quality" is shown in the attached document; this Figure: 5 Figure 1. Flowchart of the method described in the invention. The parts shown in the figure are individually numbered, and these numbers correspond to... The corresponding answers are given below: 10 Method 100 The production of battery modules is carried out using laser welding. The quality of bonding processes is improved by using thermochromic film coating. Method of invention that enables determination (100); -connecting battery cell modules over short distances to provide electricity Cleaning dust, oil and foreign matter from the busbar surface that provides transmission (101), - Production of thermochromic film (102) and 20 -the produced thermochromic film is applied to the cleaned busbar surface by laser It includes steps to visually detect the quality of the source (103). The invention method involves (100) short distances between battery cell modules Dust, oil, and 25 on the surface of the busbar, which connects to each other and enables electrical transmission. In the step of cleaning foreign matter (101), cracks on the busbar surface, The scratches and oxide layer should be examined with the naked eye or under a magnifying glass to identify the damaged areas. It is marked. 80–120 grit aluminum oxide sandpaper or belt sander. Using the machine, the oxide layer on the marked surface is homogeneous. is removed. Grit 100–150 alumina or glass beads are used, 0.4–0.6 30 Surface roughness of 3–5 µm achieved by sandblasting at MPa pressure. 4 This is ensured. Then the busbar is placed inside a 40 kHz ultrasonic cleaner. By running the solution of deionized water + 2% alkaline detergent at 50 °C for 3–5 minutes. or wipe the busbar surface with a cotton cloth first with acetone, then with isopropyl alcohol. It is cleaned by wiping to remove oil and dirt from its surface. Power 50–100 W, argon Gas or air flow rate 10–20 L / min and application time 60–5 for each surface. Atmospheric plasma device set to 90 seconds with busbar The cleaning process ensures the removal of organic residues from the surface. Afterwards, the busbar is heated in an oven at 50–60 °C or with a hot air gun for 5– It is dried for a few minutes to ensure that no solvent residue remains on the surface. In the (100) step of producing thermochromic film of the invention method (102), with a binder that is either epoxy-modified silicone or polyurethane-modified silicone resin. microcapsule core of fluorane in the form of 1,2-benzo-6-di-n-butylamino-fluorane a derivative dye and a color in the form of hydroxybenzoate or bisphenol A a developer consisting of and held in an alcohol / ester solvent TiO₂ 15 microcapsule pigment coated with a metal oxide shell in a 1:3 ratio It is placed in a container and mixed for 5 minutes using a mechanical stirrer. It is mixed. Then, 40–60 g of xylene or n- is added to adjust the viscosity. The mixture is prepared according to the spray application method by adding butyl acetate. The viscosity is brought to the range of 20–30 seconds at °C. Then, 20 To ensure homogeneous pigment distribution, mixing should be done for up to 15 minutes. By continuing and checking the mixture at 3-7 minute intervals, thermochromic A film is obtained. A thermochromic film is obtained in an application of the invention. by adding UV stabilizers, dispersants or drying agents to the mixture The dispersion of the pigment within the mixture and the film strength are increased. 25 The thermochromic film produced by the invention method (100) is cleaned of busbars. By applying it to the surface, the quality of the laser source can be visually determined (103) In this step, the prepared thermochromic film mixture is fed into a spray gun and Busbar 30 cleaned with 0.2–0.3 MPa air pressure and 0.3–0.5 mm nozzle diameter. It is applied to the surface in a thickness of 20–50 µm. As a result of the application... Thermochromic film coated busbar can be left at room temperature for 24-48 hours or 50- The resin is allowed to harden by being left at 60°C for 24-35 hours. Finally... made on the busbar surface of the battery module coated with thermochromic film The quality of laser weld seams is poor in lasers with low penetration levels. This is determined by observing the color changes of the film. 5 Industrial Application of the Invention The invention in question involves using laser sources during the production phase of battery modules. It aims to improve the quality of the merging processes performed. In this way, 10 making battery modules more reliable, durable and high-performing It contributes to the use of laser sources in industrial production processes. It enables effective monitoring and quality control. The meeting topic was "Laser Inside Battery Modules 15", centered around these fundamental concepts. A wide variety of applications for "Method of Determining Weld Quality (100)" It is possible to develop further, and the invention cannot be limited to the examples described here. It is essentially as stated in the requests. 25

Claims

6 REQUESTS 1. Using laser welding during the production phase of battery modules. the quality of the bonding processes performed on thermochromic film 5. Enables identification using coating. -by connecting the short distances between battery cell modules Dust, oil, and foreign matter on the busbar surface that transmits electricity Cleaning of substances (101), - Production of thermochromic film (102) and -By applying the produced thermochromic film to the cleaned busbar surface, 10 by visual detection of laser source quality (103) steps a characterized method (100).

2. By connecting the short distances between battery cell modules. Dust, oil and foreign matter on the surface of the busbar that provides electrical transmission. 15 In step (101) of cleaning the materials, cracks and scratches on the busbar surface and the oxide layer can be examined with the naked eye or with a magnifying glass and found to be damaged. a method like the one in Claim 1 characterized by the marking of regions (100).

3. By connecting the short distances between battery cell modules. Dust, oil, and foreign matter on the busbar surface that transmits electricity In step (101) of cleaning the materials, 80–120 grit aluminum oxide using sandpaper or a belt sander on the marked surface Claim 25 is characterized by the homogeneous removal of the oxide layer. A method like in 2 (100).

4. By connecting the short distances between battery cell modules. Dust, oil, and foreign matter on the busbar surface that transmits electricity Cleaning of materials (101) step: grit 100–150 alumina or glass 30 The surface is sandblasted using beads at a pressure of 0.4–0.6 MPa. 7 The claim is characterized by ensuring a roughness of 3–5 µm. A method like in 2 or 3 (100).

5. By connecting the short distances between battery cell modules. Dust, oil, and foreign matter on the surface of the busbar that transmits electricity. 5 In step (101) of cleaning the materials, the busbar is 40 kHz ultrasonic placed inside the cleaner and mixed with deionized water + 2% alkaline detergent solution By running it at 50°C for 3–5 minutes or by first wiping the busbar surface with a cotton cloth. Removes oil and dirt from the surface by wiping with acetone and then isopropyl alcohol. 10 as in either Claim 2 or 4, characterized by purification. a method (100).

6. By connecting the short distances between battery cell modules. Dust, oil, and foreign matter on the busbar surface that transmits electricity In step (101) of cleaning the materials, the power is 50–100 W, argon gas or 15 Air flow rate 10–20 L / min and application time 60–90 seconds for each surface. atmospheric plasma device adjusted to be on the busbar surface Claims 2 to 5, characterized by the removal of organic residues. a method like any of them (100).

7. By connecting the short distances between battery cell modules Dust, oil, and foreign matter on the busbar surface that transmits electricity In step (101) of cleaning the materials, after the cleaning process the busbar should be baked in an oven at 50–60 °C or with a hot air gun for 5– 25 minutes of drying to ensure no solvent residue remains on the surface. a method like the one in any of Claims 2 through 6 characterized by (100). In step 8 of producing thermochromic film (102), epoxy modified silicone or microcapsule 30 with binder which is polyurethane modified silicone resin. its core is a fluorane derivative in the form of 1,2-benzo-6-di-n-butylamino-fluorane from a dye and a color developer in the form of hydroxybenzoate or bisphenol A 8 formed and retained in a solvent in the form of alcohol / ester in the form of TiO₂ a microencapsulated pigment coated with a metal oxide shell in a 1:3 ratio poured into a container and stirred for 5 minutes using a mechanical mixer. A method like the one in Claim 1, characterized by mixing (100). In step (102) of producing the thermochromic film, to adjust the viscosity Apply by spraying after adding 40–60 g of xylene or n-butyl acetate. According to the method, the mixture reaches a viscosity range of 20–30 seconds at 25 °C. a method like the one in Claim 8, characterized by its introduction (100). In step (102) of producing the thermochromic film, then the pigment To ensure a homogeneous distribution, the mixing process should be continued for up to 15 minutes. Continue by checking the mixture at 3-7 minute intervals. Claims 8 or 9 characterized by the production of thermochromic films. such a method (100). 15 In step (102) of producing the thermochromic film, the obtained thermochromic UV stabilizers, dispersants, or drying agents are added to the film mixture. by adding pigment to disperse it within the mixture and improve film strength. 20, as in either Claim 8 or 10, characterized by an increase. a method (100).

12. By applying the produced thermochromic film to the cleaned busbar surface. In the step of visually detecting the quality of laser welding (103), The prepared thermochromic film mixture is fed into the spray gun and 25 Cleaned with an air pressure of 0.2–0.3 MPa and a nozzle diameter of 0.3–0.5 mm. Characterized by its application to the busbar surface at a thickness of 20–50 µm. A method like the one in claim 1 (100).

13. By applying the produced thermochromic film to the cleaned busbar surface, 30 In the step of visually detecting the quality of laser welding (103), application As a result, the thermochromic film-coated busbar can be stored at room temperature for 24-48 hours. 9 by being left to stand or by being left at 50-60 °C for 24-35 hours, the resin a like claim 12 characterized by the achievement of hardening method (100).

14. By applying the produced thermochromic film to the cleaned busbar surface, 5 In the step of visually detecting the quality of the laser source (103), the last busbar in the battery module coated with thermochromic film The quality of laser weld seams made on the surface, poor penetration. by observing the color changes of the film in lasers with a certain level A method such as in Claim 12 or 13, characterized by determination 10 (100). 20 30

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